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MarineAirr 10K Coldmate Cool Only not working..
August 27, 2009
12:28 pm
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Steve Pooler
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Forum Posts: 1127
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November 12, 2008
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Unfortunately Mitch...It's the back side of the housing where the impeller rides (closest to the motor) inside that generally melts...No resurfacing will fix it, and its not really where you can get good enough access to do so anyway...

You will see what I mean when you get it apart...The impeller is also a magnet...Magnetic Drive pump.

The pump can be wired to the compressor circuit so that it will only run with the compressor...It's just not the way they did it back then.

I'm sure they didn't expect anyone would run anything on the A/C without the thru hull open...That would just be one more thing to remember...Generally speaking if the fan is running most folks would think it's good to go...Like the wife, guest, or child ?

Steve~

August 27, 2009
12:05 pm
MitchM
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Steve, thanks  so  much  for  your  reply.  i  am off  to  the  boat  to  run the  various  electric  checks  and  pull the  pump  head.  on  this CoolMate  system , we  thought  that  we  could  run  in 'FAN only ' mode via  the  3  way  switch  ( without a  seawater  supply  to the  pump.)   and  in  fact  have  done  that FAN  ONLY  mode   a  lot  this  season.   (a  review  of  the manual  for  the  unit  does  not  say  not  to  run  in 'FAN' only  mode.)  so  we  may  well  have  fried  the  pump,  if  every  time  we  ran  in FAN only the pump  was  trying to  spin  its  impeller...

so  i  will  check  to  see  if  turning the  switch  to  the  FAN  position  sends an  electric voltage  to the  pump .  if  so,   that  is  probably  my  problem.. as  every  time  we  used  the  FAN  it  was  spinning  the pump.  o  dear. 

so  i  guess  i  will  need  at  minimum a  pump  impeller,  and  possibly to  have  the pump  head  cover  area  resurfaced  or  refinished..  and  at   worst  a new  pump.. will  be ordering  the  parts  from  you soon as  i  know  what's  up...

fair  winds, 

MitchM

August 27, 2009
11:19 am
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Steve Pooler
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Forum Posts: 1127
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November 12, 2008
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The hourly rate will not be necessary here on the forum, and it's why I started the forum…I was only asking your input about it for folks that don't want to post here…

Anyway…On to your problem finally  Laugh

The way the system was wired originally…That pump should run in the ”Fan” position on the control unless it (the wiring) has been changed or is a newer unit…This was done so that the owner could verify flow before starting the compressor (Run position) 

That system has protection for the compressor (auto reset high pressure switch & a compressor overload) but for not the pump…The pump will try to run without water thus melting the plastic impeller and it's mating surface inside the pump head…If you remove the pump head and the pump motor runs without it…Then you will need to replace the pump housing & impeller, or the pump head complete…either or all is available..You may want to check voltage to the pump first but this is the likely cause of it not running judging by your description… 

The 30 amp fuse you describe is in the main panel ?…Is it a breaker ? and if so what does it's label read ?

A 30 amp breaker is a bit large for a 10 k unit, and it might not trip when the High pressure switch auto resets, and thus allowing the compressor to attempt continuous restarts….This will either trip the overload on the compressor itself, or possibly burn a wire somewhere, and yes eventually it can burn up the compressor…

Marine Air also used a plug connection (black insulated) to connect the unit to the switch assemblies multi conductor wire…It could have burnt a connection in that plug…Try wiggling it…If stuff starts, that's where the problem is…But it needs to be fixed correctly so as not to start a fire…

You can also check the back side of the Switch Assembly for burnt connections, and also check inside the electrical box on the unit itself for burn connections too…

All these things can happen from lack of water flow…The one that fails first and stops it from operating was likely the weakest in the link that may have failed anyway during normal operation….

Does the compressor at least try to start ? (dim lights or drop voltage)

If Not…Then it likely a connection somewhere or the overload on the compressor has gone bad from cycling many times…

Dock voltage under a load is also a consideration…Low Voltage equals High Amperage…

Let me know…

Steve~

PS: I deleted the duplicate thread….

August 27, 2009
10:13 am
MitchM
Guest
Guests

we  have a  self  contained  Marineairr  installed  june 2005 , 3  way  switch OFF FAN  and AC. 2  30  amp  breakers  in  the  AC  line . well  we  accidentally  started  the  AC  with  no seawater  flowing  to  the seawater  pump. ran  for  about 5  minutes  this  way  (  no  pumping  of  water,  no  compressor  noise. )  when i  realized  no   water  flow  as  the seacock  was  off,  I shut  everything  off.  an  hour  later ,  bled  the  seawater  line, opened  seacock.  now  ther  is  no  pump  action  and  no  compressor  noise.  fan  does  run   fine. 

question:  is  there  any  overload  protection  for the  seawater  pump  (  the  30  amp  fuse ? )  did  i  ruin  the  pump by  this  5  minute  no-water  running  of the  AC ?

did  i  ruin the  compressor  by  running  with  no  water? or  does  the other  30  amp  fuse  protect  that ? 

i  have a  voltmeter, assuming  i  am  getting  good  115  volts  AC  off  my  shorepower  and  have   a good 3  way  switch,  is t here  any  other  electric  connection  i  should  be  checking  to  diagnose  this  problem... ?  i  will send  along  the  Marineairr  circuit  diagram  as  an  attachment.  by the  way the  old  bat  had  the "cruisair'  reverse  cycle   heat/AC  with the  idiot   digital  control  panel  on  it that  said  'H  Pr ' if  you  tried  to  run the  AC  without  adequate  water..  O  i  wish  the previous  owner  of  this boat  we  just  bought  had  spent  the $  on  the Cruiseair,  it  is  a  much  better  system. 

Steve, i  am  happy  to  pay  your  hourly  rate  for a  consult  on  this  issue.. we  are  in Pa ,  the  boat  was  bought  in Conn,  and  there  is  no dealer  within  150  miles  of  us...